Steam-boilek



UNITED STATES PATENT OFFICE.

DAVID MATTHEW, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-BOILEB.

Specification of Letters Patent No. 18,822, dated December 8, 1857.

To all 'whom it may concern:

Be it known that I, 'DAVID MATTHEW, of Philadelphia and State ofPennsylvania, have invented a new and useful Improvement inSteam-Boilers; and I do hereby declare that the following is a full andexact description thereof, reference being had to the accompanyingdrawings and the letters of reference marked thereon.

The nature of my invention consists in a certain improvement in thearranging of the combustion chamber, and flue tubes for the bettercombustion of the gases, also the better protection of the flue tubesand boiler surfaces from soot and luminous or products of combustion.

To enable others skilled in the art to make and use my invention, Ishall proceed to describe its construction and operation, referencebeing had to the accompanying drawings forming part of thisspecification, in which similar letters in the different figures,indicate like parts, and in which- Figure 1 is a side elevation shown insection. Fig. 2 is a vertical section at m w Fig. l. Fig. 3 is atransverse section at right angles to section Fig. 2; at y y Fig. 1.

A is the boiler shell, B the furnace, C the combustion chamber, D theflue tubes, c c c the lower combustion chamber, Gr the smoke box.

e f are draft plates in chamber c c c.

h is the exhaust pipe, I is draft pipe or sectional chimney, K is thechimney or upper section above the smoke box and boiler.

It is a well-known fact that in steam boilers where vertical orhorizontal flue tubes are used to generate steam by the application ofthe heat outside and the water inside of the tube, that they are fromthe eddies, and want of rapid current of air, or the gases, throughamong all parts of the tubes, to accumulate deposits of soot, luminousor other products of combustion to them to the entire destruction oftheir heating properties.

To obviate the injurious effects resulting from the fouling of the fluetubes, and combustion chamber, I so graduate the space between the fluetubes, so as to make the current of sufficient strength through thecombustion chamber, and among the flue tubes, so as to prevent anydeposit of soot, luminous or other products of combustion to adhere tothem; also by means of the draft plates, make the current uniformthrough the whole length of the Hue tubes and combustion chamber. I sograduate the size or area of the combustion chamber and the spacebetween the flue tubes, so that their area shall be such as to give thenecessary velocity to the current of gases, &c., to prevent the depositof the nonconducting substances, which adheres to the heating surfacesin eddies, and sluggish currents, rendering them useless. If there isany disproportion, let it be in favor of draft and cleanliness. To dothis I construct a boiler A, of the usual form of shell, and furnace B,with combustion chamber C, running through the whole length of waist,having flue tube sheet, so as to have the iue tubes running diagonallyfrom bottom to top (see Fig. 1, D), thus forming by means of the tubesan upper and lower chamber for gases, while the water has regularascending current or circulation, while the fire and gases are drawnwithgreat rapidity by the exhaust steam and draft pipe into the smoke box,through among the flue tubes in its passage from furnace to the smokebox, and the draft or current is made to be equally divided the wholelength of tubes and combustion chamber by the draft sheets e and f, inits passage to the smoke box and draft pipe, or sectional chimney insmoke box. The direction of the current is shown in Fig. 1 by thearrows, also the circulation of water in Hue tubes.

I am well aware that steam boilers are constructed with chambers throughthem, and vertical tubes arranged for passage of water through theirinside, and the passage of the heat and gases through among themhorizontally; also for the chambers to be filled with horizontal tubes,with the heat and gases passing horizontally among them; also horizontaltubes with curves or bent up ends, over the grate surface in thefurnace, with the heat and gases rising up among them and passing ofi'in a horizontal direction to the other end of them, thus filling thewhole space of the chamber for the purpose of increasing the heating ortube surface, but without any such effects as mine and I do not wish tobe mistaken as using a mere modification of such an arrangement of tubesfines D, as and for the purposes herein set and chamber or as claimingany such arforth. rangement or device.

What I claim as my invention, and desire DAVID MATTHEW 5 to secure byLetters Patent, is- Witnesses:

The arrangement of the draft plates e CHARLES D. FREEMAN, and f, inrelation to the inclined tubesv or WESLEY BRAINERD.

